Steam-engine Design: For the Use of Mechanical Engineers, Students, and Draughtsmen

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J. Wiley and sons, 1889 - Steam-engines - 391 pages
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Contents

Length of Cylinder Cylinder Bore Thickness of Piston Flange and Follower
11
Design of Piston by Empirical Methods
21
Design of Piston by Analytical Methods
22
Example on Same
24
Cylinder Design
25
Example on Same
29
CHAPTER II
32
Expansion Slidevalves
33
Zeuners Diagram for a Square Valve
35
Zeuners Diagram Considering Lap and Lead and Problems
37
DESIGNOF THE CONNECTINGROD
43
The Allen Slidevalve
46
Gozenbach or Gridironvalve
49
Problemson Same
54
ART PAGE 26 The Meyer Valve
58
27 Problems on Same
62
Adjustment of the Valves of the U S S Dispatch
65
CHAPTER III
71
The Stephenson Link 7i 30 Problems on Same
75
The Gooch Link
79
Joys Valve Gear
81
Marshalls Valve Gear
90
CHAPTER IV
95
Design of the Proportions of the Valve g8 38 Stuffingbox
104
Valvestem
111
Bolts Used in Link Motions
114
Link and Linkblock
116
Eccentricrod
120
Eccentricstraps
121
Eccentric
122
Keys for Shafts
125
CHAPTER V
128
Kinds of Compound Engines and Theory of Action of Steam in them I2 47 Raes Method of Designing Compound Cylinder Diameters I40 48 No Dr...
143
Rankines Method of Designing Compound Cylinder Diameters
146
Design of Diameters for Equal Work and Expansion in the Cylinders
152
Graphical Method of Designing Compound Cylinder Diameters Con sidering Drop
153
Summary of Methods
155
Tripleexpansion Engine Graphic Method
156
ART PAGF
161
CHAPTER VII
168
Illustration of the Effects of the Reciprocating Parts
183
Friction of the Wristpin
189
7 Weight of the Flywheel
199
Design of the Piston End of the Pistonrod
207
ART PACE 82 Diameter of the Connectingrod 217
211
The Crosshead 215
213
Design of the Crankshaft for a Single Engine
244
Design of the Crankshaft for a Twocylinder Engine
248
Design of the Crankshaft for a Threecylinder Engine Cranks 120
252
Design of the Crankshaft for a Threecylinder Engine with L P Cranks Opposite and H P Crank Midway
253
Design of the Lineshaft
254
Design of Crankand Lineshaft Bearings
259
Design of a Thrust Bearing for a Propeller Engine
263
Shaftcouplings
266
Board of Trades Rules for Shafting
272
Practical Rules for Shafting
273
CHAPTER XIII
276
Thermal Experiments and Deduction of a Formula for the Condensing Surface
278
Quantity of Condensing Water
285
Design of a Jet Condenser
294
Design of the Injection Orifice
298
Design of the Airpump
301
Design of the Circulating Pump
308
no Design of the Feedpump
314
ART PAGE 111 Flow of Water Through Pipes
317
Design of a Pump to Deliver Against a Head of Water
321
CHAPTER XIV
324
Engine Frames
327
Pillowblocks 29
329
Distance between Shaftbearings
331
Power Required for Reversing and Pumping Engines
333
Size and Strength of Pipes
335
Distance Between Hangers for a Pipe
337
Design of Stopvalves
338
Design of Cocks
340
Design of Expansion joints
343
Standard Screwthreads
344
Walkingbeams
349
CHAPTER XV
353
The Indicated Horsepower for Vessels
355
Radial Paddlewheel
358
Design of a Feathering Paddlewheel
360
Design of Parts of a Paddlewheel
365
The Screwpropeller ?h
368
The Diameter and Pitch of the Screw
371
Area of Screwblades and their Dimensions
372
Kinds of Screwpropellers
375
Strength of Materials
381
Saturatedsteam Table
385
Supplement to 65
387
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Page 155 - ... cylinder. Another rule is to make the cylinder ratio equal to the total ratio of expansion multiplied by the fractional part of the stroke completed when cut-off occurs in the high-pressure cylinder.
Page 370 - These elements are — 1. the useful thrust, or ship's true resistance ; 2. the augment of resistance, which is due to the diminution which the action of the propeller creates in the pressure of the water against the stern end of the ship ; 3. the equivalent of the friction of the screw blades in their edgeway motion through the water ; 4. the equivalent of the friction due to the dead weight of -the working parts, piston packings, and the like, which constitute the initial or slow-speed friction...
Page 83 - E direct to the connecting-rod at A, and allowing the centre F to slide in a straight slot. By a just balancing against each other of the errors so produced, and by making the centre F of the lever E, and the centre of the disc K, to coincide at varying points in the travel of the former, a fair motion may...
Page 83 - B nearer to or further from A ; by this means a later point of cut-off may be given to either end of the cylinder at will, and the engine may thus have more steam admitted to one side of the piston than to the other, if required. The same thing may be done for the lead. By altering the position of the crank for which the levercentre F coincides with the centre of the slot J, an increased or a diminished lead may be given.
Page 82 - In that position steam is admitted at each end of the stroke to the amount only of the lead ; and this is done exactly equally on each side of the centre line, the amount of lead being constant for forward and backward motion, and for all degrees of expansion. Thus, when the crank is set at the end of the stroke either way, the centre, F, of the...
Page 81 - M, thereby causing the curved path traversed by the centre F of the lever E to cross the vertical centre line, and •diverge from it on either side at will. The forward or backward motion of the engine is governed by giving the slot this inclined position on one or other side of the vertical centre line ; and the amount of expansion depends on the amount of the inclination, the exactly central or vertical position being
Page 370 - OY (fig. 79), and if we were to draw a line through the intersection parallel to the base, the height which would be thus cut off from the thrust ordinates would represent the deduction to be made from them in respect of constant or initial friction, and the remainders of the ordinates between this new base and the curve would be approximately proportional to the ship's true resistance.
Page 83 - A on the connecting-rod, there would be imparted to the centre F of that lever an unequal vibration above and below the centre of the disc K. The extent of inequality would be twice the versed sine of the arc described by the lower end D of the lever E ; and this would give an unequal port and unequal cut-off for the two ends of the stroke. But this error is corrected by attaching the lower end D of the lever E to the vibrating link B...
Page 401 - LIBRARY GRADUATE SCHOOL OF ENGINEERING HARVARD UNIVERSITY Please sign your name and address on this card, and deposit in box provided. This book may be kept...
Page 81 - ... to the amount of its vibration at the point A ; the centre, F, is for this purpose carried vertically in a slot, J, which is curved to a radius equal to the length of the link, G, connecting the lever, E, to the valve spindle. The slot itself is formed in a disc or sheave, K, which is concentric with the centre, F, of the lever, E, at the moment when that lever is in the position given by the piston being at either end of the cylinder. This...

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